CN103215849A - Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali - Google Patents
Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali Download PDFInfo
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- CN103215849A CN103215849A CN2013101538553A CN201310153855A CN103215849A CN 103215849 A CN103215849 A CN 103215849A CN 2013101538553 A CN2013101538553 A CN 2013101538553A CN 201310153855 A CN201310153855 A CN 201310153855A CN 103215849 A CN103215849 A CN 103215849A
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- lime
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- calcium carbonate
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Abstract
The invention discloses a method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkila. The method comprises the following steps of: carrying out oxidation-reduction onto S<2-> in green liquor by utilizing basic oxidant, so that Fe<2+> is not generated in a white-clay preparation process. The method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali is used for fixing the iron in the material into Fe<3+> by utilizing the basic oxidant and reducing the S<2-> in the green liquor into the SO4<2->, so that the reducibility is relieved, and therefore, the whiteness of the white-clay calcium carbonate is improved and the refining of the white-clay calcium carbonate is realized.
Description
Technical field
The invention belongs to pulp technology for making paper, relate to a kind of improved soda pulping alkali recovery white slime fine paper pearl filler method.
Background technology
The alkali that the paper industry white clay comes from paper industry reclaims, and is meant the winnofil that generates behind green liquor in the alkali recovery process and the calcium hydroxide generation causticizing reaction, because of containing certain water, so be called white clay.In the Papermaking Alkali Recovery Process, one ton of alkali of every recovery produces 1.3～1.4 tons white clay approximately, thereby has caused the white clay generation in China's paper industry every year to surpass 4,000,000 tons.In order to make full use of resource, Papermaking Alkali Recovery Process the is supporting recycle utilization of white clay is about to white clay and calcines in converter, obtains quick lime, again quick lime is recycled and reused for the causticizing reaction of alkali recovery process, thereby realizes the recycle of white clay in alkali recovery process.This technology more at home and abroad is to obtain implementing in the large-scale pulping and paper-making integrated factory of raw material with timber, and obtains the good environment effect.Yet the silicone content of grass as raw material makes grass as raw material alkali recovery white slime silicone content height far above wood raw material, and the quick lime after the calcining easily hardens, and recycle is difficult to carry out, and most of enterprises all adopt outward transport landfill or directly discharging to alkali recovery white slime.
Residue as alkali recovery process produces contains a large amount of CaCO in the white clay
3, also contain a spot of alkaline matter and other compositions.When as the simple landfill of solid waste, not only take a large amount of places, the contained buck of white clay also can ooze out the water that permeates the ground, polluted underground water source by extruding simultaneously; And directly discharging can bring river course Yu Ji, water pollution etc.Obviously, landfill is easy to generate secondary pollution with direct discharging, can not satisfy environmental requirement.
From existing research, white clay to be made with extra care, preparation papermaking adds the effective means that the calcium carbonate of filling out usefulness is a kind of recycling alkali recovery white slime, not only can effectively prevent secondary pollution, can reduce the paper production cost simultaneously.Yet from present domestic system fine paper pearl filler production line, prepared calcium carbonate whiteness is lower, as filler use the back paper to brighten pressure big.The calcium carbonate whiteness is low, is because the solid content impurity in the green liquor brings.From the prior art, in order to eliminate of the influence of green liquor solid content impurity to the alkali recovery white slime whiteness, main by modes such as green liquor clarification, green liquor purifications, Chinese invention patent CN1441117A, CN1436894A etc. as application, these modes can effectively be removed the solid content impurity in the green liquor, improve the white clay whiteness, but gained white clay whiteness still is lower than commodity winnofil whiteness, is unfavorable for the production of high whiteness paper.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of improved soda pulping alkali recovery white slime fine paper pearl filler method, can significantly improve the alkali recovery white slime whiteness.
To achieve these goals, the technical solution used in the present invention is:
A kind of improved soda pulping alkali recovery white slime fine paper pearl filler method utilizes alkaline oxidiser with the S in the green liquor
2-Carry out redox, make the white clay preparation process not generate Fe
2+Thereby, improve the white mud calcium carbonate whiteness, realize the refining of white mud calcium carbonate.
Described alkaline oxidiser is one or several in clorox, SODIUM PERCARBONATE, sodium perborate or the potassium perborate.
Described green liquor is handled in the following way:
(1) the turbid green liquor that furnace room is come places one section preprocessor, under temperature 50-80 ℃, with the Na in the green liquor
2O counts, and adds the meticulous milk of lime of its quality 0.1-0.3%, changes green liquor clarifier over to after stirring, settling time 1-8 hour;
(2) green liquor after the clarification enters two sections preprocessors, under temperature 30-80 ℃, with the Na in the green liquor
2The O meter, the alkaline oxidiser that adds its quality 0.01-0.1% reacts, and reaction time 0-4 hour, is prepared as and purifies the back green liquor.
Green liquor after the described purification utilizes causticization milk of lime to carry out causticization, 100-700 rev/min of causticization mixing speed, temperature 60-95 ℃, time 1-4 hour, the alkali recovery white slime suspension of system.
Described causticization milk of lime prepares in the following way:
(1) will utilize the 100-600 mesh sieve to sieve after the lime pulverizing, be prepared as meticulous milk of lime behind the tiny lime slaking after sieving, standby;
(2) utilize the 100-200 mesh sieve to sieve again behind the thick lime slaking after sieving, remove impurity in the milk of lime;
(3) milk of lime after sieving adds Ca (OH)
2The alkaline oxidiser of quality 0.01-0.5% after stirring, reacted 0-4 hour, was prepared as causticization milk of lime.
With gained white clay suspension wash, scalping, reduce residual alkali content and remove the thick slag of bulky grain, feed industrial liquid CO then
2, separate wadding and carbonization, keep pH value 8-9.5, CO
2Pressure 0.2-0.4MPa crosses 600 eye mesh screens after the white clay fine screen after the carbonization, standby.
From the prior art, by removing the solid content in the control green liquor, can effectively improve the alkali recovery white slime whiteness, but its whiteness still can not reach the whiteness index of winnofil.By discovering, its whiteness is on the low side, mainly is the Fe that contains trace in green liquor and the lime
3+, owing to there is the S of trace in the green liquor simultaneously
2-Thereby, make Fe
3+Be oxidized to the tangible Fe of color and luster easily
2+Thereby, make the whiteness of white clay be difficult to further raising.Especially in the Straw Pulp alkali recovery process,, add saltcake during burning, will have a strong impact on the white clay whiteness in order to remedy the alkali deficiency.During Straw Pulp slurrying, whether use vulcanized sodium to pulping process and not influence of slurrying result.Therefore, the present invention utilizes alkaline oxidiser that the ferropexy in the raw material is Fe
3+, with the S in the green liquor
2-Be reduced to SO
4 2-, eliminate its reducibility, thereby improve the white mud calcium carbonate whiteness, realize the refining of white mud calcium carbonate.
The specific embodiment
Describe embodiments of the present invention in detail below in conjunction with embodiment.
Embodiment 1:
(1) will utilize 600 mesh sieves to sieve after the lime pulverizing, be prepared as meticulous milk of lime behind the tiny lime slaking after sieving, standby;
(2) sieve and utilize 200 mesh sieves to sieve again behind the thick lime slaking, add 0.1% clorox (to Ca (OH) at milk of lime by 200 mesh sieves
2Meter), after stirring, reacted 1 hour, be prepared as causticization milk of lime, standby;
(3) the turbid green liquor that furnace room is come places one section preprocessor, under 70 ℃ of temperature, adds 0.2%(to the Na in the green liquor
2The O meter) meticulous milk of lime changes green liquor clarifier over to after stirring, settling time 6 hours;
(4) green liquor after the clarification enters two sections preprocessors, under 50 ℃ of temperature, adds 0.1%(to the Na in the green liquor
2The O meter) clorox reacts, and in 2 hours reaction time, is prepared as and purifies the back green liquor;
(5) green liquor after will purifying utilizes causticization milk of lime to carry out causticization, 300 rev/mins of causticization mixing speeds, 85 ℃ of temperature, 4 hours time, the alkali recovery white slime suspension of system;
(6) gained white clay suspension wash, scalping, reduce residual alkali content and remove the thick slag of bulky grain;
(7) with the liquid CO of industry
2The white clay suspension that feeds washing, scalping is separated wadding and carbonization, pH value 9, CO
2Pressure 0.3MPa; Reacted white clay is through crossing 600 eye mesh screens after the fine screen.
Embodiment 2:
(1) will utilize 400 mesh sieves to sieve after the lime pulverizing, be prepared as meticulous milk of lime behind the tiny lime slaking after sieving, standby;
(2) sieve and utilize 100 mesh sieves to sieve again behind the thick lime slaking, add 0.05% SODIUM PERCARBONATE (to Ca (OH) at milk of lime by 100 mesh sieves
2Meter), after stirring, reacted 2 hours, be prepared as causticization milk of lime, standby;
(3) the turbid green liquor that furnace room is come places one section preprocessor, under 60 ℃ of temperature, adds 0.1%(to the Na in the green liquor
2The O meter) meticulous milk of lime changes green liquor clarifier over to after stirring, settling time 4 hours;
(4) green liquor after the clarification enters two sections preprocessors, under 50 ℃ of temperature, adds 0.05%(to the Na in the green liquor
2The O meter) SODIUM PERCARBONATE is reacted, and in 3 hours reaction time, is prepared as and purifies the back green liquor;
(5) green liquor after will purifying utilizes causticization milk of lime to carry out causticization, 400 rev/mins of causticization mixing speeds, 70 ℃ of temperature, 3 hours time, the alkali recovery white slime suspension of system;
(6) gained white clay suspension wash, scalping, reduce residual alkali content and remove the thick slag of bulky grain;
(7) with the liquid CO of industry
2The white clay suspension that feeds washing, scalping is separated wadding and carbonization, pH value 8.5, CO
2Pressure 0.28MPa; Reacted white clay is through crossing 600 eye mesh screens after the fine screen.
Embodiment 3:
(1) will utilize 200 mesh sieves to sieve after the lime pulverizing, be prepared as meticulous milk of lime behind the tiny lime slaking after sieving, standby;
(2) sieve and utilize 100 mesh sieves to sieve again behind the thick lime slaking, add 0.2% sodium perborate (to Ca (OH) at milk of lime by 100 mesh sieves
2Meter), after stirring, reacted 0.5 hour, be prepared as causticization milk of lime, standby;
(3) the turbid green liquor that furnace room is come places one section preprocessor, under 50 ℃ of temperature, adds 0.3%(to the Na in the green liquor
2The O meter) meticulous milk of lime changes green liquor clarifier over to after stirring, settling time 4 hours;
(4) green liquor after the clarification enters two sections preprocessors, under 40 ℃ of temperature, adds 0.07%(to the Na in the green liquor
2The O meter) sodium perborate reacts, and in 2 hours reaction time, is prepared as and purifies the back green liquor;
(5) green liquor after will purifying utilizes causticization milk of lime to carry out causticization, 500 rev/mins of causticization mixing speeds, 90 ℃ of temperature, 6 hours time, the alkali recovery white slime suspension of system;
(6) gained white clay suspension wash, scalping, reduce residual alkali content and remove the thick slag of bulky grain;
(7) with the liquid CO of industry
2The white clay suspension that feeds washing, scalping is separated wadding and carbonization, pH value 8.8, CO
2Pressure 0.4MPa; Reacted white clay is through crossing 600 eye mesh screens after the fine screen.
Made white clay measurement result is as follows:
| Index name | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Whiteness (%) | 93.7 | 91.9 | 92.8 |
| The pH value | 9.4 | 9.7 | 9.2 |
| Settling volume (mL/g) | 4.5 | 5.7 | 5.4 |
| Particle mean size (μ m) | 6.7 | 7.5 | 6.1 |
Claims (6)
1. an improved soda pulping alkali recovery white slime fine paper pearl filler method is characterized in that, utilizes alkaline oxidiser with the S in the green liquor
2-Carry out redox, make the white clay preparation process not generate Fe
2+Thereby, improve the white mud calcium carbonate whiteness, realize the refining of white mud calcium carbonate.
2. improved soda pulping alkali recovery white slime fine paper pearl filler method according to claim 1 is characterized in that described alkaline oxidiser is one or several in clorox, SODIUM PERCARBONATE, sodium perborate or the potassium perborate.
3. improved soda pulping alkali recovery white slime fine paper pearl filler method according to claim 1 and 2 is characterized in that described green liquor is handled in the following way:
(1) the turbid green liquor that furnace room is come places one section preprocessor, under temperature 50-80 ℃, with the Na in the green liquor
2O counts, and adds the meticulous milk of lime of its quality 0.1-0.3%, changes green liquor clarifier over to after stirring, settling time 1-8 hour;
(2) green liquor after the clarification enters two sections preprocessors, under temperature 30-80 ℃, with the Na in the green liquor
2The O meter, the alkaline oxidiser that adds its quality 0.01-0.1% reacts, and reaction time 0-4 hour, is prepared as and purifies the back green liquor.
4. improved soda pulping alkali recovery white slime fine paper pearl filler method according to claim 3, it is characterized in that, green liquor after the described purification utilizes causticization milk of lime to carry out causticization, 100-700 rev/min of causticization mixing speed, temperature 60-95 ℃, time 1-4 hour, the alkali recovery white slime suspension of system.
5. improved soda pulping alkali recovery white slime fine paper pearl filler method according to claim 4 is characterized in that described causticization milk of lime prepares in the following way:
(1) will utilize the 100-600 mesh sieve to sieve after the lime pulverizing, be prepared as meticulous milk of lime behind the tiny lime slaking after sieving, standby;
(2) utilize the 100-200 mesh sieve to sieve again behind the thick lime slaking after sieving, remove impurity in the milk of lime;
(3) milk of lime after sieving adds Ca (OH)
2The alkaline oxidiser of quality 0.01-0.5% after stirring, reacted 0-4 hour, was prepared as causticization milk of lime.
6. improved soda pulping alkali recovery white slime fine paper pearl filler method according to claim 4 is characterized in that, with gained white clay suspension wash, scalping, reduce residual alkali content and remove the thick slag of bulky grain, feed industrial liquid CO then
2, separate wadding and carbonization, keep pH value 8-9.5, CO
2Pressure 0.2-0.4MPa crosses 600 eye mesh screens after the white clay fine screen after the carbonization, standby.
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| CN2013101538553A CN103215849A (en) | 2013-04-28 | 2013-04-28 | Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali |
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|---|---|---|---|
| CN2013101538553A CN103215849A (en) | 2013-04-28 | 2013-04-28 | Method for recycling white-clay refined paper calcium carbonate filler by improved soda-process pulping alkali |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256652A (en) * | 2015-09-18 | 2016-01-20 | 金华盛纸业（苏州工业园区）有限公司 | Method for improving whiteness of papermaking filler |
| CN107574707A (en) * | 2017-09-20 | 2018-01-12 | 林龙 | A kind of preparation method of the special powdered whiting of papermaking |
| CN108677598A (en) * | 2018-06-26 | 2018-10-19 | 陕西科技大学 | A kind of preparation method of alkali recovery white slime fine paper pearl filler |
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| US20030049194A1 (en) * | 2000-01-18 | 2003-03-13 | Haruo Konno | Method for producing calcium carbonate |
| CN102303885A (en) * | 2011-08-23 | 2012-01-04 | 陕西科技大学 | Method for refining white clay calcium carbonate from green solution produced in alkali recovery from grass pulp |
| CN102659161A (en) * | 2012-05-08 | 2012-09-12 | 山东轻工业学院 | Process for preparing white mud calcium carbonate from green liquor recovered from wood pulp sulfate-method pulping alkali |
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2013
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| US20030049194A1 (en) * | 2000-01-18 | 2003-03-13 | Haruo Konno | Method for producing calcium carbonate |
| CN102303885A (en) * | 2011-08-23 | 2012-01-04 | 陕西科技大学 | Method for refining white clay calcium carbonate from green solution produced in alkali recovery from grass pulp |
| CN102659161A (en) * | 2012-05-08 | 2012-09-12 | 山东轻工业学院 | Process for preparing white mud calcium carbonate from green liquor recovered from wood pulp sulfate-method pulping alkali |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256652A (en) * | 2015-09-18 | 2016-01-20 | 金华盛纸业（苏州工业园区）有限公司 | Method for improving whiteness of papermaking filler |
| CN107574707A (en) * | 2017-09-20 | 2018-01-12 | 林龙 | A kind of preparation method of the special powdered whiting of papermaking |
| CN108677598A (en) * | 2018-06-26 | 2018-10-19 | 陕西科技大学 | A kind of preparation method of alkali recovery white slime fine paper pearl filler |
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Application publication date: 20130724 |